Method and device for managing allocation of data transmission paths in a meshed communications network, corresponding computer program product and storage means

Active Publication Date: 2009-10-15
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0048]This approach prevents the activation of the new retransmission matrix if this m

Problems solved by technology

Communications in a wireless communications network very frequently undergo inte

Method used

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  • Method and device for managing allocation of data transmission paths in a meshed communications network, corresponding computer program product and storage means
  • Method and device for managing allocation of data transmission paths in a meshed communications network, corresponding computer program product and storage means
  • Method and device for managing allocation of data transmission paths in a meshed communications network, corresponding computer program product and storage means

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Embodiment Construction

[0085]In all the figures of the present document, the identical elements and steps are designated by the same numerical references.

[0086]FIG. 1 shows a communications network 100 in which the invention can be implemented. This is a meshed wireless communications system comprising several communications nodes referenced 110, 120, 130, 140, 150, 160. More specifically, each of the nodes of the communications network 100 is capable of sending and receiving data.

[0087]The following description considers the particular case of the broadcasting of a data content to the communications node 160, also called a final receiver node or destination node, in a communications network 100, by means of super-frames transmitted during an STDC (Synchronous Data Transmission Cycle). A super-frame consists of radio packets sent out by a set of nodes of the network during an SDTC in a predetermined sequence of access to the medium. This set of nodes includes the communications node 110, also called a sou...

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Abstract

A method for managing allocation of paths for transmission, in packets of symbols, of at least a first data content, each content being transmitted from a source node up to a destination node in a meshed communications network comprising a plurality of nodes, each destination node receiving a plurality of copies of a same packet of symbols of the content transmitted to said destination node by a source node, each copy being received by the destination node via a distinct transmission path directly from the source node or via at least one relay node of the meshed communications network, the packets being encoded with an error correction code enabling decoding by erasure of packets symbols. Such a method comprises the following steps: selecting a set of transmission paths from the source node up to the destination node for the transmission of copies of at least one packet of the first content, for which an estimated first number of erasures of symbols of the at least one packet is smaller than a determined threshold, the first number of erasures being estimated from a piece of information on quality of transmission that is determined and associated with each of the selected transmission paths, the threshold being determined as a function of an erasure correction capability of the error correction code; allocating the selected transmission paths to the transmission of the first content from said source node up to said destination node.

Description

1. FIELD OF THE INVENTION[0001]The field of the invention is that of systems of data transmission in wireless meshed synchronous communications networks.[0002]More specifically, the invention relates to a technique of bandwidth allocation based on error correction in synchronous communications networks that may be subjected to fading and masking caused by fixed or moving obstacles.[0003]The invention can be applied more particularly in the context of the broadcasting of data packets, i.e. cases where a node of the network, called a source node or sender node, broadcasts data packets intended for another node, called a destination node or final receiver node, through the communications network.[0004]The invention can be applied especially to networks where the data packets are relayed by a set of nodes of the network to the destination node. This mode of transmission enables the reception, by the destination node, of a set of copies of the same data packet that will be exploited in o...

Claims

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Application Information

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IPC IPC(8): H04W72/04
CPCH04L25/14H04W40/20H04W40/16H04L45/00H04L45/243
Inventor ACHIR, MOUNIRLAGRANGE, PASCAL
Owner CANON KK
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